Process of sterilizing.



To. all whom it may concern:

- new and useful Im rovements in Processes oi Sterlhzmg, ofwhlch the following '1s a for securing,to-tlie fullest extent, the re- 1 once of many thousands of bacteria to the" cubic centimeter, and subject it in a suitable our present application is a new-andhighly plicable to many other' fluids and solids in sure to that of the atmosphere' After such free from bacteria? or livin sterilized.

ARTIIITUR g. BALDWIN, OF EAST Be it known that we, ARTHUR J. BALD- \'\'IN and JA'MEsj F. LESTER, both citizens of v the United States, residing at-East Orange, county of Essex, and" State of'New Jersey, and New York, county and State of New. York, respectively, have invented certain full, clear, and exact' description.

The discovery which forms the subject of effective process of sterilization, primarily intended. forthe'treatmerit of milk, but apwhich, either for. purposes of preservation, or as a sanltary precautionfor lmmedlate use and consumption, or other likepurposes, J

it isdesirable to destroy or inhibit the, growth or development. of deleterious germs and livingorganisms. r

In practicing our process we subject the substance to be sterilized or preserved to a pressure that will be exerted upon its individual molecules, by applying a gaseous pressure much, above the normal, and then relieving such pressure, and theprocess may be practiced by any -known means or appliances which are capable of effecting these operations. 4 j, Y 7

In practically carrying out this process sults in view, we have proceeded as follows: We take, say, a quantity of milk, which may show upon bacteriological analysis the preschamber or receptacle to an airor gaseous pressure of from one hundred to two hundred pounds to the square' inch', and main tain the pressurefor a period of an "hour or more, and then reduce or relievethe prestreatment the milkhasbeen found upon analysis to be practically and even entirely organisms of any kind, or, in other wor s, to have been 1' By the application of this process, not only] fluids, ut [solids and semi-solids of Speeification of Letters Patent.

Application filed February 16, 1909. Serial No. 478,321.

' UNlTED STATES; PATENT- o IoE.

ORANGE, NEW JERSEY, AND JAMES F. LESTER, OF NEW YORK, Y. I

PROQESS OF STERILIZINGf Patented May 4, 1909. 7

animal and vegetable matter may be freed from living organisms and sterilized. In order to be sure of this result, we prefer to apply an air or gaseous'pressure of approximately. two hundred pounds and to maintain such pressure for several hours, but as the invention involves essentially the ap lica tion of a pressure which, in its efiect, 1s destructive of bacteria or inhibitive of their growth or evelopment, it is manifest that it isnot imited to the period of time nor to the use. of the exact pressure above named.

We have found,-for example, that the application of pressures from sixty pounds up to three hundred, for periods varying from which consists in subjecting such substances to a sustained gaseous pressure.

. The process of sterilizing substances containing bacteria, which consists in subjecting such substances to air pressure. 4; The process of sterilizing substances of the kind described, and preventing the growthor development of bacteria therein,

- which consists insubjecting-such substances to'a sustained airpressure. 5. The process of ster1l1z1ng, substances containing bacteria, which consists in sub jecting such substances to pressure ofagas,

and then withdrawing or relieving such pressure. v

6. The process of sterilizing substances containing bacteria, wh ch consists n subjecting siichsubstances to air pressure,and

' then withdrawing or relievi-n such pressure recess of sterilizing substances 7. The p of tlie kin described, which consists in. sub--;

jecting the same to 2. sustained gaseous prestures in the presence of two subscribing Witsure destructive of living organisms and nesses. Q then withdrawing or relievlng such pressure. ARTHUR J BALDWVIN *8. The process of sterilizing milk and pre- 5 venting the. growth or development of bac- JAMES L teria therein, which consists in. subjecting I Witnesses: the same to a sustained gaseous pressure. EDWARD T. MAGOFFIN,

In testimony. whereof We afiix our signa- PHILIP S. HILL. 

